I cant get the external clock input to work on my MFOS 16-step sequencer. If I short the input to ground, it will advance a step, but if I hook up an LFO (with a diode to cut out the neg part), it wont budge. R18 and R23 are the correct values, and the LFO gives a high enough voltage to trigger the clock. Any ideas?

I think I read somewhere that the external clock needs to be near v+. An LFO would most likely put out a signal between +-5v. There used to be a schematic on how to adapt the input signal on the mfos site, cant seem to find it now.

I think I read somewhere that the external clock needs to be near v+. An LFO would most likely put out a signal between +-5v. There used to be a schematic on how to adapt the input signal on the mfos site, cant seem to find it now.

Hey!
How did you get on with this? I also have a question about the voltage needs of the ext clock input of the 16 Step seq;

I use the little Doepfer MSY2 to drive the sequencer in my SH101 (which works great), however it doesn't seem to drive the MFOS 16 Step. I guess this is something to do with it not outputting a strong enough voltage?

The manual says that the MSY2 outputs "... a periodic TTL signal (0/+5V) representing the tempo" - do you think this needs to be boosted to -/+ 15v ?

A quick and simple solution I used on the clock input of my 16 Step Sequencer is just a N-Channel Mosfet and a Pulldown Resistor (~10k).
It will accept any Input Clock Signal that exceeds the treshhold voltage (typically 2-3V).

The Disadvantage (!):
It will only trigger the the step when voltage rises from LOW to HIGH. So you need a trigger input. If you apply a gate signal that lasts for one note, the sequencer will step after the note was played.

I'm wondering why Ray didn't design it more compatible. You should at least be able to trigger your MFOS Sequencer with your MFOS Synthesizers...

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